USB to CAN Converter

	USB to CAN Converter I-7565 lets you to communicate with CAN devices easily from PC using the built-in USB interface. The PC can be the CAN host, monitor the CAN Network or execute HMI panels to access/control CAN devices. Download the I-7565 data sheet as a PDF file.
	Converter Facts
	1. RS-485 drivers and receivers also support RS-422 signals. RS-485 drivers support 32 loads, RS-422 drivers drive just 7 loads. They have the same signal levels. 2. All of our powered converters come with an AC power adapter. 3. Two-wire devices use one pair of wires for the transmit and receive signals. This means you have to switch the transmitter off when not transmitting to avoid blocking messages from the RS-485 device. The I-7561 includes logic for turning off the RS-485 transmitter. 4. RS232 has become the short hand way of searching for RS-232. Keyword USB to RS232 Converters is the same as USB to RS-232 Converters, USB to RS422 Converters is the same as USB to RS-422 Converters, and USB to RS485 Converters is the same as USB to RS-485 Converters.

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NE555 Electronic Buzzer Schematic

NE555 Electronic Buzzer Schematic

This accessible cyberbanking buzzer ambit congenital based on timer works for accepting the frequency. The IC timer NE 555 acclimated as astable multivibrator operating at about 1kHz and produces a complete back switched on. The complete abundance can be adapted by capricious the 10K resistor. You may change the 10K resistor with capricious resistor.

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Micro Power AM Broadcast Transmitter Schematic

Micro Power AM Broadcast Transmitter

In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a capacitor/resistor combination. A 100pF capacitor is used in place of the crystal for VFO operation. Amplitude modulation is accomplished with a second transistor that controls the DC voltage to the output stage. The modulator stage is biased so that half the supply voltage or 6 volts is applied to the output stage with no modulation. The output stage is tuned and matched to the antenna with a standard variable 30-365 pF capacitor. Approximately 20 milliamps of current will flow in the antenna lead (at frequencies near the top of the band) when the output stage is optimally tuned to the oscillator frequency. A small ‘grain of wheat’ lamp is used to indicate antenna current and optimum settings. The 140 uH inductor was made using a 2 inch length of 7/8 inch (OD) PVC pipe wound with 120 turns of #28 copper wire. Best performance is obtained near the high end of the broadcast band (1.6 MHz) since the antenna length is only a very small fraction of a wavelength. Input power to the amplifier is less than 100 milliwatts and antenna length is 3 meters or less which complies with FCC rules. Output power is somewhere in the 40 microwatt range and the signal can be heard approximately 80 feet. Radiated power output can be approximated by working out the antenna radiation resistance and multiplying by the antenna current squared. The radiation resistance for a dipole antenna less than 1/4 wavelength is

R = 80*[(pi)^2]*[(Length/wavelength)^2]*(a factor depending on the form of the current distribution) The factor depending on the current distribution turns out to be [(average current along the rod)/(feed current)]^2 for short rods, which is 1/4 for a linearly-tapered current distribution falling to zero at the ends. Even if the rods are capped with plates, this factor cannot be larger than 1. Substituting values for a 9.8 foot dipole at a frequency of 1.6 MHz we get R= 790*.000354*.25 = .07 Ohms. And the resistance will be only half as much for a monopole or 0.035 Ohms. Radiated power at 20 milliamps works out to about I^2 * R = 14 microwatts.

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Double Side Band AM Transmitter Circuit

The circuit of AM transmitter is designed to transmit (amplitude modulated) DSB (double side band) signals. A modulated AM signal consists of a carrier and two symetrically spaced side bands. The two side bands have the same amplitude and carry the same information. In fact, the carrier itself coveys or carries no information. In a 100% modulated AM signal 2/3 rd of the power is wasted in the carrier and only 1/6th of the power is contained in each side band.

In this transmitter we remove the carrier and transmitt only the two side bands. The effective output of the circuit is three times that of an equivalent AM transmitter.

Op Amp IC741 is used here as a microphone amplifier to amplify the voice picked up by the condenser microphone. The output of the op amp is fed to the double balanced modulator (DBM) build around four IN4148 diodes. The modulation level can be adjusted with the help of preset VR1.

The carrier is generated using crystal oscillator wired around BC548 transistor T2. The carrier is further amplified by transistor T1, which also acts as a buffer between carrier oscillator and the balanced modulator. The working frequency of the transmitter can be changed by using crystals of different frequencies. For multi frequency operation, selection of different crystals can be made using a selector switch.

Ths output of the DBM contains only the product (of audio and carrier) frequencies. The DBM suppresses both the input signals and produces double side band suppressed carrier (DSBSC) at its output. However, since the diodes used in the balanced modulator are not fully matched, the output of the DBM does contain some residual carrier. This is known as carrier leakage. By adjusting the 100 ohm preset VR2 and trimmer C7 you can null the carrier leakage.

To receive DSB signals you need a beat frequency oscillator to reinsert the missing carrier. If you don’t have a beat frequency oscillator, or want to transmitt only AM signal, adjust preset VR2 to leak some carrier so that you can receive the signals on any ordinary radio receiver. In AM mode 100% modulation can be attained by adjusting preset VR1 and VR2.

The DSBSC signal available at the output of the balanced modulator is amplified by two stages of RF linear amplifiers. Transistor 2N2222A (T3) is used as an RF pre amplifier, which provides enough signal amplification to drive the final power amplifier build around transistor SL100B. The output of the final power amplifier is connected to the antenna.

All coils are to be wound ferrite balun core (same as used in TV balun transformer of size 1.4 cm * 0.6 cm) using 24 swg enameled copper wire. Proper heat sink should be provided for SL100B transistor used as final power amplifier.

X1 – 8+8 Turns Bifalar 24 SWG On TV Balune Core
X2 – Primary 12 Turns, Secondary 4 Turns. 24 SWG on TV Balun Core (dot indicates start of coil).
X3 – 20 Turns 24 SWG on TV Balun Core

Range of the circuit depends on the type of antenna used. It is very important to use matched antenna to radiate the signals effectively. I used horizontal dipole antenna, which is simple and easy to construct. For 7 MHz, ie 40 meter ham band the length of dipole antenna will be 20 meter. Use 75 Ohms co-axial cable to connect antenna and transmitter. I was able to get 57 report from station 80 kilometer away. You can easily add a Linear RF amplifier using IRF830 to get more power.

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Power Amplifier Circuit with 2n3055

Power Amplifier Circuit with 2n3055

Simple and low cost. The optimal accumulation voltage is about 50V, but this amp assignment from 30 to 60V. The acute ascribe voltage is about 0.8 – 1V. As you can see, in this architecture the apparatus accept a big tolerance, so you can body it about of the components, which you acquisition at home. The and transistors can be any NPN blazon ability transistor, but do not use Darlington types… The achievement ability is about 60W.

Descriptions:

- capacitor C1 regulates the low frequencies (bass), as the capacitance grows, the low frequncies are accepting louder.

- capacitor C2 regulates the college frequencies (treble), as the capacitance grows, the college frequencies are accepting quiter.

- this is a chic B amplifier, this means, that a accepted charge breeze through the end transistors, alike if there is no arresting on the input. This accepted can be adapted with the 500Ω trimmer resistor. As this accepted incrases, the complete of the amplifier gets better, but the end transistors are added heating. But if this accepted decrases, the transistors are not heating so much, but the complete gets worse…

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Rangkaian Jam Digital

kema Rangkaian Jam Digital

The figure on the right is displaying the condition to be displaying 10:32:54 p.m. switching every 500 milliseconds. In the switching time of the actual circuit, it is 1 millisecond. So, all digit sees to be displayed at the same time. The light of the LED is 1/6 compared with the continuation lighting-up.

The specification of the display position is controlled by the binary signal which is output from RA0, RA1 and RA2 port of PIC. This signal is decoded in CPLD and eight kinds of signals are made. This time, six kinds are used. Only the transistor which corresponds to the L level decoder output becomes ON condition. The LED which is connected with the transistor becomes a lighting-up possible condition.
In the tens-hour display, only “1″ is displayed. So, I put the display of AM/PM. 74HC138 can be used for the 3-8 decoder, too.

Segments of the lighting-up of each digit are controlled using 7 ports of RC6 from RC0 of PIC. The output of these ports is common to all the LEDs. However, only the LED of the digit which was specified by RA0-2 is controlled in the lighting-up. The LED lights up when the RC port is an L level.
The brightness of the LED depends on the kind of the LED. When the brightness is different extremely, the resistors which are connected with the RC ports should be separated. This time, because it is approximately the same brightness, resistors are made common.

Because the maximum voltage which is applied to the pin of PIC is 5V, I make the power of the LED 5V.

More about digital clock circuit,please visit here

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1000 Watt Mosfet Power Inverter circuit

This power inverter circuit will provide a very stable “Square Wave” Output Voltage. Frequency of operation is determined by a pot and is normally set to 60 Hz. Various “off the shelf” transformers can be used. Or Custom wind your own for best results.

Additional MosFets can be paralleled for higher power. It is recommended to Have a “Fuse” in the Power Line and to always have a “Load connected”, while power is being applied. The Fuse should be rated at 32 volts and should be aproximately 10 Amps per 100 watts of output. The Power leads must be heavy enough wire to handle this High Current Draw! appropriate Heat Sinks Should be used on the RFP50N06 Fets. These Fets are rated at 50 Amps and 60 Volts. Other types of Mosfets can be substituted if you wish.

There ARE Limitations! I have had numerous requests for an Inverter for 1000 watts and Even MORE. Sorry I Don’t feel this is Practical. At 1000 Watts and operating from a 12 Volt Source, the Input Current will be close to 100 AMPS. That would Require a HUGH Size of a Primary Wire.

1000 Watt Mosfet Power Inverter

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120 Watt Audio Power Amplifer Circcuit with IC TDA7294

audio amplifer 120watt circuit

Here is a simple and easy to build general purpose 120 W. Amplifer with IC number TDA7293 for process sound system.
This amplifer was have the input for a radio, TV, stereo or other line level device.
It also has a phono input for a record player, guitar, microphone or other un-amplified source.
With the addition of a low pass filter at the input, it makes a great amp for a small subwoofer.

Parts

R : 660 Ohm 1/4 W Resistor = 2 pcs.
R : 22K 1/4 W Resistor = 5 pcs.
R : 10K 1/4 W Resistor = 1 pcs.
R : 30K 1/4 W Resistor = 1 pcs.
C : 2200uF 35V Electrolytic Capacitor = 2 pcs.
C : 0.22uF Capacitor = 2 pcs.
C : 22uF Capacitor = 4 pcs.
C : 0.45uF Capacitor = 2 pcs.
U1,2 : TDA7294 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

T1 : 50V Center Tapped 5 Amp Transformer
S1 : SPST 3 Amp Switch
S2 : DPDT Switch
F1 : 2 Amp Fuse
SPKR1 : 8 Ohm 120W Speaker
MISC : Case, Knobs, Line Cord, Binding Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2

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Clarion APX280M 2-Channel Power Amplifier Wiring Diagram

The Clarion APX280M is a full-featured two-channel amplifier featuring specially coated circuit boards, pulse-Width Modulated (PWM) MOSFET power supply for maximum performance with minimal distortion, advanced circuitry design featuring bridgeable and mixed mode operation for use in various system configurations, 2-ohm stereo stable, 4-ohm mono stable, gold-plated power, speaker, and RCA connectors.

The APX280M uses an unregulated MOSFET power supply for superior sound and output wattage. In addition, a toroid-coil is used to transfer power with minimal performance loss due to heat. To avoid unwanted noise, a double-sided conformal printed circuit board with strategically placed components keeps AM RFI subdued.

The following wiring diagram of Clarion APX280M 2-Channel Power System Amplifier in many application such as Bridged – Mono Subwoofer System, 2-Channel Full-Range, Satellite, or Subwoofer Stereo System, Mixed-Mode Satellite and Subwoofer System.

Find more info about Clarion APX280M 2-Channel Power Amplifier Wiring Diagram here – free download PDF file from clarion.com

more detail on /teknikelectronika.blogspot.com

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